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    • 58. 发明授权
    • Cable protection system and method of reducing an initial stress on a cable
    • 电缆保护系统和减少电缆初始应力的方法
    • US08881521B2
    • 2014-11-11
    • US13587383
    • 2012-08-16
    • Alan L. BrownePaul W. AlexanderNancy L. Johnson
    • Alan L. BrownePaul W. AlexanderNancy L. Johnson
    • F01B29/10F02G1/04D02G3/02D02G3/36E01D19/16D07B5/12D07B1/06D07B5/00
    • D07B5/00D07B1/0673D07B5/12D07B2201/2009D07B2205/3085E01D19/16D07B2801/10
    • A method of reducing an initial stress on a cable includes stretching the cable to a first length to thereby define the initial stress. The cable has a central longitudinal axis, and includes a plurality of wires each twisted around the axis and formed from a shape memory alloy transitionable in response to a signal between a first state wherein each of the wires has a first temperature-dependent length, and a second state wherein each of the wires has a second temperature-dependent length that is less than the first. After stretching, the method includes activating the alloy by exposing the alloy to the signal such that the alloy transitions from the first to the second temperature-dependent state. Concurrent to activating, the method includes elongating the cable to a second length that is greater than the first to define a second stress on the cable that is less than the first.
    • 减少电缆上的初始应力的方法包括将电缆拉伸到第一长度,从而限定初始应力。 所述电缆具有中心纵向轴线,并且包括多个电线,每个电线绕所述轴线扭转并且由形状记忆合金形成,所述形状记忆合金可响应于第一状态而可转换,所述信号处于第一状态,其中每条电线具有第一温度依赖性长度,以及 第二状态,其中每条线具有小于第一温度的第二温度依赖长度。 拉伸后,该方法包括通过将合金暴露于信号来激活合金,使得合金从第一温度依赖于第二温度依赖状态转变。 与激活同时,该方法包括将电缆延伸到大于第一长度的第二长度,以限定小于第一应力的电缆上的第二应力。